In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture.
Answer:
D
Explanation:
Insulator is like rubber, it cant physically hold heat well
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1) 4min = 4*60 sec = 240 sec
2) Distance = speed times time = 3 * 240 = 720 m
